Well, if something is 2d it is flat, like the screen you are looking at right now, reading this.
so 3d, is when something is practically there, and looks more realistic, pic up anything in your house that isn't paper or something as flat, and that's 3d.
.don't even get me started about 4d...
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By definition a sphere is 3D. If it were only 2D it would be a circle.
a rectangle in 3D A brick shape.
A flat-faced brick.
A parallelogram prism (or parallelpiped) is a 3D parallelogram, so it looks like a cuboid pushed to the side.
something idiot